Jakub Grajchman (25 July 1822 – 9 June 1897) was a Slovak poet and dramatist.
Born in Hybe, Grajchman studied in Prešov. He lived most of his life in Liptovský Mikuláš and Liptovský Hrádok, where he worked as a notary and judicial advisor, before returning to his birthplace, where he also died.
A supporter of Ľudovít Štúr in his Slovak language standartisation programme (manifested also by his consistent use of the Slovak spelling for his surname, which is of German origin), Grajchman did not rank among the most prominent Slovak-writing authors of the period. Nevertheless, his works proved very popular with the common folk, especially his collection of poems, Básnické spisy Jakuba Grajchmana (The Poetic Works of Jakub Grajchman), published in 1890. Apart from writing poetry, Grajchman was also a dramatist, mostly authoring plays for amateur theaters. However, one of his plays, Kto zaplatí nohavice? (Who Will Pay the Trousers?) from 1867, was adapted and broadcast as a radio play in the 20th century.